Echoing the above. Don’t worry about it too much, just let her speak and let her finish her sentences. Do not correct her or ask her to repeat. Try to find ways to boost her self-confidence with daily affirmations, let her hear words coming from her mouth such as “I have a beautiful voice, my voice is worthy, I am worthy of love”. This is so important! I am almost crying writing you this as I grew up in a household where my mother would yell at me whenever I stuttered, she once threw a book at me that she was forcing me to read without stuttering. She would roll her eyes whenever I spoke. She traumatised me for life, my stammer got worse and stayed to this day. I am 26. Be the opposite extreme of my mother. Make your girl feel like she is free to express herself in any way, like her speech is perfect and interesting, and that you love her so much the way she is. She will grow her self confidence and her stammer will go away on its own. I wish I had this growing up.